我的python人脸识别项目面临这种类型的错误。凸轮灯亮起，但不'；t显示摄像机界面

我的python人脸识别项目面临这种类型的错误。摄像头指示灯亮起，但不显示摄像头界面

如果cv2.waitKey（100）&0xFF==ord（'q'）：cv2.error:OpenCV（4.2.0）C:\projects\OpenCV python\OpenCV\modules\highgui\src\window.cpp:717:error:（-2:Unspecified error）函数未实现。使用Windows、GTK+2.x或Cocoa支持重建库。如果您使用的是Ubuntu或Debian，请安装instal

---

 def TakeImages():         
        Id =(txt.get())  
        name =(txt2.get()) 
        if(is_number(Id) and name.isalpha()):
            cam = cv2.VideoCapture(0)
            harcascadePath = "C:/Users/Lenovo/AppData/Local/Programs/Python/Python36/Lib/site-packages/cv2/data/haarcascade_frontalface_default.xml"  
            detector = cv2.CascadeClassifier(harcascadePath)  
            sampleNum = 0 
            while(True):
                ret,img = cam.read()
                gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  
                faces = detector.detectMultiScale(gray, 1.3,5) 
                for (x, y, w, h) in faces:
                    cv2.rectangle(img, (x, y), ( x + w, y + h), (255, 0, 0), 2)
                    sampleNum=sampleNum + 1
                    cv2.imwrite("C:\Users\Lenovo\AppData\Local\Programs\Python\Python36\TrainingImages\ "+name +"."+Id +'.'+ str(sampleNum) + ".jpg", gray[y:y + h, x:x + w]) 
                    cv2.imshow('frame', img) 
                if cv2.waitKey(100) & 0xFF == ord('q'):
                                break
                elif sampleNum>60:
                   break
            cam.release() 
            cv2.destroyAllWindows()
            res = "Images Saved for ID: " + Id +" Name: "+ name   
            row = [Id, name]  
            with open('C:/Users/Lenovo/AppData/Local/Programs/Python/Python36/studentDetails\StudentDetails.csv', 'a+') as csvFile:
                writer = csv.writer(csvFile) 
                writer.writerow(row)
            csvFile.close() 
            message.configure(text = res)
        else:
            if(is_number(Id)):
                    res = "Enter Alphabetical Name"
                    message.configure(text = res) 
            if(name.isalpha()): 
                    res = "Enter Numeric Id"
                    message.configure(text = res)

Error..

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python36\lib\idlelib\run.py", line 137, in main
    seq, request = rpc.request_queue.get(block=True, timeout=0.05)
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python36\lib\queue.py", line 172, in get
    raise Empty
queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
  File "C:\Users\Lenovo\Desktop\Face recognision syystem36.py", line 96, in TakeImages
    if cv2.waitKey(100) & 0xFF == ord('q'):
cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:717: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvWaitKey'